Construction Type Plywood

Detailed information for December 2007





Record number:


The monthly survey, Construction Type Plywood, measures quantities of construction type plywood that are produced and shipped by Canadian manufacturers including distribution of shipments in Canada by province and exports.

Data release - February 20, 2008


As of the December 2007 reference period, this survey has been cancelled.

This survey measures, on a monthly basis, the quantities of construction type plywood that are produced and shipped by Canadian manufacturers and the distribution of shipments in Canada and exports.

The quantities of construction type plywood produced and shipped are used as an indicator of the economic condition of the industry and trends in the construction market, as an input to Canada's Gross Domestic Product and as an input into macro- and micro-economic studies to determine market shares and industry trends. Data are used by the business community, trade associations, federal and provincial departments and international organizations.

Reference period: Month

Collection period: April, July, October, January


  • Manufacturing
  • Wood, paper and printing

Data sources and methodology

Target population

The target population for this survey includes manufacturers in Canada of Construction Type Plywood as defined in the Standard Classification of Goods (SCG) that report this product to the Annual Survey of Manufactures and Logging or ASML (record number 2103). This means that estimates from this survey do not cover the entire universe of Construction Type Plywood producers in Canada because the ASML does not survey all businesses. Instead, the ASML uses administrative data to cover the small and medium-sized establishments. These manufacturers are not part of this monthly survey.

Instrument design

The questionnaire for this survey has remained stable over the years, although the format and wording has been modified to maintain its relevance based on feedback from survey respondents and data users.


This survey is a census with a cross-sectional design.

Data are collected for all units of the target population, therefore no sampling is done.

Data sources

Responding to this survey is mandatory.

Data are collected directly from survey respondents.

Monthly data are collected at the end of a quarter for three preceding months, from survey respondents using a mail-out / mail-back process. Data capture and preliminary editing are performed simultaneously to ensure validity of the data. Businesses from whom no response has been received or whose data may contain errors are followed-up by telephone or fax.

Under normal circumstance, data are collected, captured, edited, tabulated and published within 6-8 weeks after the end of every quarter.

View the Questionnaire(s) and reporting guide(s) .

Error detection

In order to detect errors and internal inconsistencies, automated edits are applied to captured data to verify that totals equal the sum of components and that the data are consistent with previous month's data. Data that fail the edits are subject to manual inspection and possible corrective action.

In addition, subject matter experts analyse the data at a more aggregate level to detect and verify any large month-to-month or year-over-year changes for the industry.


Missing data for the current month are imputed automatically by applying to the previous month's value, the month-to-month change observed for the same period in the previous year, for the unit in question. However, an option exists for analysts to manually override this imputation with a better estimate based on pertinent knowledge about the industry or the business.


This methodology type does not apply to this statistical program.

Quality evaluation

Survey results are analyzed to ensure comparability with patterns observed in the historical data series and the economic condition of the industry. Information available from other sources such as the Monthly Survey of Manufacturing or MSM (record number 2101), the Building Permits Survey (record number 2802), the media, other government organizations and industry association are also used in the validation process.

Disclosure control

Statistics Canada is prohibited by law from releasing any data which would divulge information obtained under the Statistics Act that relates to any identifiable person, business, or organization without the prior knowledge or the consent in writing of that person, business, or organization. Various confidentiality rules are applied to all data that are released or published to prevent the publication or disclosure of any information deemed confidential. If necessary, data are suppressed to prevent direct or residual disclosure of identifiable data.

Direct disclosure may occur when the value in a tabulation cell is composed of a few responses or when the cell is dominated by a few companies. Residual disclosure may occur when confidential information can be derived indirectly by piecing together information from different sources or data series.

Revisions and seasonal adjustment

Data may be revised to include amended information or reports from respondents that are received after the end of the collection cycle. Revisions are disseminated in a subsequent period and reflected in the CANSIM series.

Data accuracy

The methodology of this survey has been designed to promote data accuracy. Since data are collected from all Canadian producers of Construction Type Plywood, as defined in the target population, the resulting estimates are not subject to sampling error. However, the results are still subject to the non-sampling errors associated with coverage, non-response, inaccurate reporting, and processing. Errors relating to coverage and non-response can be measured. All attempts are made to control inaccurate reporting and processing errors.

Coverage error
There is a degree of under coverage (referred to as coverage error) in the survey results as there is generally a lag between the time a new business comes into existence and when it is included in the universe of this sub-annual survey. This is due to the fact that the list of companies surveyed is derived from the latest available survey results of the ASML which are not available until 15 months after the reference period.

This error is kept at a minimum by also using advance information from the ASML, feedback from the MSM, industry associations, trade journals and newspaper articles, to identify new survey units.

Coverage error based on ASML 2004 (latest available survey results), is estimated at 4%.

Non-response error
Some respondents may be unable to provide data for numerous reasons (i.e. fire, theft, strike, economic hardship, etc.), while others may be late in responding. To minimize non-response, delinquent respondents are followed up rigorously by phone or fax. Data for non-responding units are imputed using industry trend and other related information.

Non-response error is calculated using the number of non-responses in the year divided by the number of total expected responses in the year. The average non-response error for the Construction Type Plywood survey was estimated at 6% for 2005 (the last completed cycle).

Inaccurate response
Inaccuracy may result from poor questionnaire design or an inability on the part of respondents to provide the requested information or from misinterpretation of the survey questions. To reduce such errors the format and wording in the questionnaire are reviewed from time to time and modified based on feedback from survey respondents and data users. Respondents are also reminded of the importance of their contribution and of the accuracy of reported information.

Processing errors
These errors may occur at various stages in the processing of survey data such as data entry, verification, editing and tabulation. Data are examined for such errors using automated edits along with an analytical review by subject matter experts. Several checks are performed on the collected data to verify internal consistency and comparability over time.

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